Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
FROM R-1 TO “SATELLITE”
This year — 100 years since the birth of S. P. Korolev, the father of the Soviet space program, the outstanding designer of the first artificial satellites and spacecraft, the Creator of...
GENTLE HAMMER
The surface will remain perfect, if the wrong nail at nastilke a parquet or parquet boards remove with a hammer glued to it with glue of type "Moment" leather lining.
